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0., H. ROSENT'HAL. TOOL FOR REMOVING SHELL GROWNS FROM TEETH.

Patented May 14, 1889.

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UNITED STATES PATENT OFFICE.

CHARLES HENRY ROSENTHAL, OF CINCINNATI, OHIO, ASSIGNOR OF ONE- THIRD TOLOUIS XV. VVYLER.

TOOL FOR REMOVING SHELL-CROWNS FROM TEETH.

SPECIFICATION forming part of Letters Patent No. 403,293, dated May 14,1889.

7 Application filed March 18, 1889. Serial No. 303,668. (No model.)

To all whom it may concern.-

Beitknown that I, CHARLES HENRY RosEN- THAL, a citizen of the UnitedStates, residing in Cincinnati, Hamilton county, Ohio, have inventedcertain new and useful Improvements in Devices for Removing Shell-Crownsfrom Teeth, of which the following is a specification, reference beinghad to the accompanying drawings, forming a part hereof, in which-Figure 1. is my invention. Fig. 2 is a ver tioal section through thecenter of all the parts, enlarged, with the top of the handle brokenaway. Fig. 3 is a detail of the clamp. Fig. 4 is a detail of theelongated nut, having a flange on the lower edge. Fig. 5 is ashellcrown, which I do not claim as part of my invention, but show itfor illustration.

Similar letters of reference throughout the several figures denote thesame parts.

In the drawings, H is the handle, having on one end a screw-threadedshaft, S, adapted to work in the elongated screw-threaded nut N, havinga flange on its lower end.

C is the clamp, having a hole in the center of its top adapted to fitloosely about the nut N and having its sides bent at right angles to thetop and the lower end of the sides bent in at right angles to the sameto form flanges, as seen at 0, adapted to fit under and engage with thelower edge of a shell-crown, O, having a hole in the center of its topadapted to allow the end of the screw-threaded shaft S to pass throughon either side of a tooth.

Operation: I operate myinvention by passing the screw-threaded nut 'Nthrough the hole in the top of the clamp C, pass the screwthreaded shaftS through the nut N until the end of the shaft S is passed through thehole in the top of the shell-crown 0 and rests upon the tooth, the sidesof the clamp C having been passed down the sides of the shellcrown 0until the flange 0 springs into place under the edges of theshell-crownand on either side of the tooth. By turning the handle H the nut Npasses through the hole in clamp C, (about which said clamp is looselyjournaled,) till the flange on the nut N comes in contact with the clampC, and by continuing to turn the handle H the nut N, pressing againstthe the clamp C 011 the nut N for the purpose of enabling the operatorto change the handle from a perpendicular to almost any angle, andpressure can be had on a tooth in any part of the mouth. In the drawingsI show a handle of the ordinary tools of dentists; but, if necessary,the handle can be short and perforated, having holes cut at right anglesadapted to receive a lever for the purpose of turning the shaft S in thenut N, or the shaft S can be at taohed to a flexible shaft and turned inthat manner, so that a shell-crown can be readily removed from any partof the mouth.

- I only show one form of constructing the clamp C; but when necessaryfordifferentshaped teeth I change the form of the lower part of theclamp to conform to the shape of the tooth, or I make the lower end ofthe clamp pointed with the flanges, as occasion may require.

Having thus fully described my invention, what I claim as new therein,and desire to obtain by Letters Patent, is-

In a device for removing shell-crowns from teeth, the elongated internalscrew-threaded nut N, adapted to receive a screw-thread shaft, S, incombination with the clamp C, loosely journaled on the nut N, having theflanges c, substantially as shown and described.

The foregoing specification of my invention signed by me this 9th day ofMarch, A. D. 1889.

CHARLES HENRY ROSENTHAL.

Witnesses:

J EPTHA GARRARD, P. J. CADWALLADER.

